12.1: About Gri Mode

• It can complete partially typed commands, builtin variables and synonyms (`gri-complete', `M-Tab') and help you edit the syntax that was thus inserted for you (`gri-option-select', `C-c C-o'; `gri-option-kill', `C-c C-k').
• It can provide a short help synopsis concerning the command on the current line (`gri-help-this-command', `C-c C-h'), or load the info manual for that command (`gri-info-this-command', `C-c C-i'). It knows the list of all Gri commands, and can provide help or info regarding any of them (`gri-help', `C-c M-h'; `gri-info', `C-c M-i') using command name completion at the prompt (`Tab').
• All Gri commands are listed in a pull-down menu from the menubar, which you can use to either enter the text of the selected command, or obtain help or info about it.
• It can help you find an unknown command by listing all containing a given word (`gri-apropos', `C-c C-a').
• It fontifies your Gri code using colour coding.
• It indents if statements, loops, and so on (`gri-indent-line', `Tab').
• It can let you run Gri and view its output without leaving the editor (`gri-run', `C-c C-r'). If an error is encountered, Emacs will rearrange the buffer so the cursor is on the bad line of the Gri command-file.
• If you've already run Gri, and therefore have a PostScript output file, the mode will let you view that file (`gri-view', `C-c C-v') even if that file is compressed.

Thus one never has to leave Emacs; type `C-c C-r' to run Gri, and if there is no error, the graph comes up automatically. If there was an error, gri-mode will move editing point to the line with the error and display the error message. Given that the mode can complete partially typed commands, this means a substantial saving in development time.

Inside gri-mode, type `C-h m' for help on the mode, including a list of all commands and key definitions.